Mine sounds a little fuzzy. One time the sound was very distorted. It was on the Sirius, everything else sounded fine. I had to shut the car down and when it was restarted, the distortion was gone. But it always sounds fuzzy.

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11 E70 x35D
07 E92 335i*
05 E83 X3 3.0*
02 E39 540i*
92 E36 325i*
* Retired/Sold